MiTAC 8050QMA Manuel de service télécharger pdf (Page 130)

129

50QMA

N/B Maintenance

8.10 Audio Test Error-1

No sound from speaker after audio driver is installed.

Re-test

OK?

Test

OK?

Audio Failure

1. Check if speaker cables are

connected properly.

2. Make sure all the drivers are

installed properly.

Try another known good

speaker, CD-ROM.

Board-level

Troubleshooting

Yes

Check the following parts for cold solder or one of the following parts on the

motherboard may be defective,use an oscilloscope to check the following signal

or replace parts one at a time and test after each replacement.

1.If no sound cause

of line out, check

the following

parts & signals:

2. If no sound cause

of MIC, check

the following

parts & signals:

3. If no sound cause

of CD-ROM, check

the following

parts & signals:

Parts:

U517

U19

U709

J509

L60

L61

Q48

L20

L18

L73

Q510

Signals:

AMP_RIGHT

AMP_LEFT

DEVICE_DECT

DECT_HP#OPT

SPDIFOUT

SPK_OFF

EAPD

OPTIN#

Parts:

U517

U709

U16

U17

MIC1

J720

J721

L71

L74

L554

L543

L548

Signals:

+5VS

+3VS

+VA

MIC_VREF

MIC1

MIC2

MIC_EXT

Parts:

U709

U517

J710

R420

R407

R438

R419

R406

R434

Signals:

CDROM_LEFT

CDROM_RIGHT

CDROM_COMM

Correct it.

Replace

Motherboard

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MiTAC 8050QMA Manuel de service Page 130

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